Corneal tomography and biomechanics in primary pterygium

Purpose To study the Scheimpflug’s imaging and corneal biomechanics in primary pterygium. Methods A prospective observational study of 55 patients with unilateral primary nasal pterygium was done. The normal fellow eyes of patients with pterygium were taken as controls. Clinical parameters noted inc...

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Bibliographic Details
Published in:International ophthalmology 2018-04, Vol.38 (2), p.663-671
Main Authors: Vanathi, M., Goel, Sahil, Ganger, Anita, Agarwal, Tushar, Dada, T., Khokhar, Sudarshan
Format: Article
Language:English
Subjects:
Aberration
Acuity
Astigmatism
Biomechanics
Cornea
Curvature
Eye
Eye (anatomy)
Imaging
Medical imaging
Medicine
Medicine & Public Health
Ophthalmology
Original Paper
Parameters
Patients
Resistance factors
Statistical analysis
Visual acuity
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Summary:Purpose To study the Scheimpflug’s imaging and corneal biomechanics in primary pterygium. Methods A prospective observational study of 55 patients with unilateral primary nasal pterygium was done. The normal fellow eyes of patients with pterygium were taken as controls. Clinical parameters noted included visual acuity, values of corneal curvature by doing Scheimpflug imaging, wavefront aberrations in terms of higher and lower-order aberrations and corneal hysteresis (CH) as well as corneal resistance factor (CRF) values by using ocular response analyzer. Results Of the total 55 patients, mean age was 43.0 + 11.4 years (range: 20–72 years). Mean LogMar uncorrected visual acuity in pterygium eyes and control eyes was 0.21 + 0.20 and 0.12 + 0.15, respectively ( p  = 0.016). On Scheimpflug imaging the mean anterior corneal curvature values (Ka1/Ka2 D) were 41.09 + 3.38/44.33 + 2.29 in pterygium eyes, 43.13 + 1.79/43.98 + 2.17 in control eyes ( p   0.05). Analysis of corneal aberrations showed significantly higher corneal wavefront aberrations in pterygium eyes. Highest correlation of corneal astigmatism was noted with corneal area encroached by pterygium ( ρ  = 0.540 for LOA and 0.553 for HOA) and distance from pupillary center ( ρ  = 0.531 for LOA and 0.564 for HOA). Corneal biomechanical parameters including CH and CRF were found to be lower in the pterygium eyes, though not statistically significant ( p value 0.60 and 0.59, respectively). Conclusion Pterygium leads to deterioration of visual performance not only by causing refractive and topographic changes but also by causing a significant increase in corneal wavefront aberrations.
ISSN:0165-5701
1573-2630
DOI:10.1007/s10792-017-0514-6